What functions do I need to replicate the "Play" section of the toolbar

Development Pipeline & Plugins
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1

I am trying to write plugin that I intend to use across multiple projects and I want to group all the toolbar buttons I have into a single block with an additional menu item similar to how the play/stop section is.

So far I can make toolbar buttons and bind functions to them no problem. But when I try to add an menu to that button I can’t get it to work. I assumed that I would be using the AddSubMenu() function that is part of the FToolMenuEntry object, but it appears to not work as I intended.
When looking for examples online the only ones I could find were from several years ago the syntax seems to have changed. When I tried to replicate them I get compilation errors related to lvalues.

Has anyone done this themselves or know of a decent up to date example I can learn from?

My RegisterMenus() function:

void FBuildingGenModule::RegisterMenus()
{
	// Owner will be used for cleanup in call to UToolMenus::UnregisterOwner
	FToolMenuOwnerScoped OwnerScoped(this);

	FToolMenuSection& Section    = UToolMenus::Get()->ExtendMenu("LevelEditor.LevelEditorToolBar.PlayToolBar")->FindOrAddSection("WorldGen");
	FToolMenuEntry&   Menu       = Section.AddEntry(FToolMenuEntry::InitToolBarButton(FBuildingGenCommands::Get().BuildingGenMenu));
	FToolMenuEntry&   MenuEntry  = Section.AddSubMenu(FName(TEXT("Hello There")),
													  FText::FromString("Label"),
													  FText::FromString("ToolTip"),
													  FNewToolMenuChoice(),
	                   								  FToolUIActionChoice(FExecuteAction::CreateRaw(this, &FBuildingGenModule::PluginButtonClicked)),
	                   								  EUserInterfaceActionType::Button);
	
	Menu.SetCommandList(PluginCommands);
	MenuEntry.SetCommandList(PluginCommands);
}

Any help is appreciated, thanks in advanced.